How it works?
? Insert two AA(LR6) size batteries in the battery compartment.
? Ensure all wires are connected to the battery terminals and spring connector as stated wiring
sequence and connection.
? Bend the spring connector over then insert the exposed shiny conductor part of wire into spring
connector and ensure the wire is securely connected to spring connector.
? Turn the switch on and see the bird and bear play on the seesaw.
? If the circuit does not work, you can check the wire and spring connector connection whether it
is not well connected or insulated plastic part of the wire you inserted to spring connector.

Science Behind motion transformation:
Both bird and bear are like playing on the seesaw. As the bird moves, the bear will also
move accordingly. This is because both of them are on the same leverage.
Why the rotational power of the motor will cause the bird and the bear to move left and
right? This is due to same simple mechanical trick. When you assemble the parts, you can see
seesaw panel and gear cap are the key to converting rotational force to left and right motion.
And as season panel connects to both the bird and the bear, both of them move accordingly.

Do you know?
Difference between Torque and Work
Notice that the units for torque and work are basically the same, yet torque and work are
two different things. Torque is a force that causes a rotation, which means that it does not
actually cause an object to move along a distance. Therefore, torque is not work.

01

Torque is the product of force and distance.

X

Torque

Force

t
=F x d

Distance

Torque
2 feet

Torque
2lb-ft

2 pound

2lb-ft

1 pound

There is 2lb-ft of torque being
applied to the two bolts below.

On a rotating shaft, the work is done by the torque.
This is because torque is a force about a circle, and the shaft is a
circle. The force is going round and round, and so is the shaft,
so if we "unroll" the shaft, we have a force traveling across a
linear distance. That's work. On a rotating shaft, the torque is
doing the work.

1 feet

There is no torque on the bolt below
because the path of force is passing
through the boltâ&#x20AC;&#x2122;s centre.

On a rotating shaft (like an axle), the torque is doing the work, and the shaft's rotational speed is
time-dependent, so shaft power is the product of its rotational speed and its torque. Using arbitrary
units, the power formula for a rotating shaft is:
Shaft power using arbitrary units.

Quiz
1 . What would happen if we change the arrangement of the gears in the gearbox as shown in
fig?

(a)
(b)
(c)
(d)

02

It will require more power to rotate shaft easily
It will require less power to rotate shaft easily
There will be no change in rotation of shaft
Shaft will not rotate

2. What would happen if we change the arrangement of the gears in the gearbox as
shown in fig?

(a)
(b)
(c)
(d)

It will require more power to rotate shaft easily
It will require less power to rotate shaft easily
There will be no change in rotation of shaft
Shaft will not rotate

3. Which Gear box assembly transmits more power?
a)

c)

b)

d) All them transmits same amount of
power.

03

How to connect: Follow below steps as figure shown.
1• Install the bear (01) on the main panel
(03). Match the key hole to the protruding
lock of the main panel. Install the bird (02)
on the main panel (03). Match the key
hole to the protruding lock of the main
panel. Insert the lever (06) and cap (07) to
the main panel (03).

2• Insert the seesaw panel
(04) to the panel support (05).

3• Connect the pre-assembled main
panel (03) to the seesaw panel (04)
and the panel support (05). (Make
sure they are properly locked in
position, and both the bird and bear
ends are locked in right position of
the seesaw panel (04) as figure
shown.)

4• Insert the gear cap (08)
to the gearbox (09).

04

5• Install the assembled
seesaw unit on the box base
(13)

6• Install the gearbox (09) on the
box base (13) then connect the
seesaw unit and the gearbox
together. (Make sure they are
properly locked at the right position).

7• Install battery compartment
(10) on the box base (13).

8• Install ON/OFF switch
(11) on the box base (13).

05

9• Install 3 spring connectors
(12a, 12b, 12c) on the box
base (13). Narrow end down,
push the spring as far as it will
go.

11• Connect one wire of the
ON/OFF switch to the spring
connector (12b) and the other one
connect to the spring connector
(12c).

12• Connect the gearbox (09) to
the spring connects, red wire to
the spring connector (12b) and
black wire to the spring
connector (12a).

06

Gallery:
http://www.physics.uoguelph.ca/tutorials/torque/Q.torque.intro.html
What are torque and its example?
http://id.mind.net/~zona/mstm/physics/mechanics/forces/torque/introductionToTorque.html
An introduction to torque
http://craig.backfire.ca/pages/autos/horsepower
What is horsepower and torque?
http://www.howstuffworks.com/gear.htm/printable
How gear works?

Warning !
Do not short-circuit the battery terminals and spring connectors. It may cause
overheating. Do not lock the motor or other moving parts, it may cause overheating.